SN74LS641NS

Buffers, Drivers, Receivers, Transceivers Overview

The SN74LS641NS is an octal bus transceiver from the Texas Instruments 74LS series, housed in a 20-pin PDIP package. It features open-collector outputs and bidirectional data flow controlled by a direction input. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a temperature range of 0°C to 70°C. Key electrical parameters include a maximum low-level output current of 24 mA and a high-level output current of -15 mA. Propagation delay is typically 15 ns at 5 V with a 45 pF load.

Buffers, Drivers, Receivers, Transceivers Feature Summary

• Octal configuration providing eight independent bidirectional bus transceivers in a single integrated circuit.
• Open-collector output structure allowing for wired-OR connections and flexible interfacing with various logic families.
• Direction control pin enables seamless switching of data flow between port A and port B without bus contention.

Buffers, Drivers, Receivers, Transceivers Applications

• Bidirectional data buffering on microprocessor-based system buses.
• Interface bridging between different logic families or voltage domains requiring open-collector compatibility.
• Memory address and data bus buffering in industrial control systems.

Buffers, Drivers, Receivers, Transceivers Procurement Notes

Verify the specific suffix 'NS' confirms the 20-lead plastic dual-in-line package (PDIP) variant. Confirm RoHS compliance status as older LS series parts may have varying environmental declarations. Ensure the supplier provides genuine Texas Instruments components to avoid counterfeit logic ICs that may exhibit incorrect propagation delays or output drive capabilities.

Buffers, Drivers, Receivers, Transceivers Selection Notes

Select this component when an octal transceiver with open-collector outputs is required for bidirectional bus applications. The LS series offers standard TTL input levels suitable for legacy systems. Consider the SN74LS641N if through-hole mounting is necessary, or the SN74LS641D for surface-mount requirements. Verify that the open-collector nature meets the pull-up resistor requirements of the target circuit design.

Buffers, Drivers, Receivers, Transceivers Part Context

This part belongs to the Texas Instruments 74LS64x family of octal bus transceivers. It shares functional similarities with the SN74LS640 and SN74LS642 but differs in output polarity and type. The SN74LS641 specifically provides non-inverting true outputs with open-collector characteristics, distinguishing it from the inverting variants in the same series.

Buffers, Drivers, Receivers, Transceivers Replacement Considerations

Direct pin-compatible substitutes include the SN74LS641N (standard PDIP) and SN74LS641DW (SOIC). Cross-family replacements like the SN74ALS641AN offer faster speeds but require verification of power consumption and input threshold compatibility.